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Tom Rini83d290c2018-05-06 17:58:06 -04001// SPDX-License-Identifier: GPL-2.0+
Álvaro Fernández Rojas18393f72017-05-03 15:10:21 +02002/*
3 * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
4 *
5 * Derived from linux/arch/mips/bcm63xx/reset.c:
6 * Copyright (C) 2012 Jonas Gorski <jonas.gorski@gmail.com>
Álvaro Fernández Rojas18393f72017-05-03 15:10:21 +02007 */
8
9#include <common.h>
10#include <dm.h>
11#include <errno.h>
Simon Glassf7ae49f2020-05-10 11:40:05 -060012#include <log.h>
Simon Glass336d4612020-02-03 07:36:16 -070013#include <malloc.h>
Álvaro Fernández Rojas18393f72017-05-03 15:10:21 +020014#include <reset-uclass.h>
15#include <asm/io.h>
Simon Glasscd93d622020-05-10 11:40:13 -060016#include <linux/bitops.h>
Simon Glassc05ed002020-05-10 11:40:11 -060017#include <linux/delay.h>
Álvaro Fernández Rojas18393f72017-05-03 15:10:21 +020018
19#define MAX_RESETS 32
20
21struct bcm6345_reset_priv {
22 void __iomem *regs;
23};
24
25static int bcm6345_reset_assert(struct reset_ctl *rst)
26{
27 struct bcm6345_reset_priv *priv = dev_get_priv(rst->dev);
28
29 clrbits_be32(priv->regs, BIT(rst->id));
30 mdelay(20);
31
32 return 0;
33}
34
35static int bcm6345_reset_deassert(struct reset_ctl *rst)
36{
37 struct bcm6345_reset_priv *priv = dev_get_priv(rst->dev);
38
39 setbits_be32(priv->regs, BIT(rst->id));
40 mdelay(20);
41
42 return 0;
43}
44
45static int bcm6345_reset_free(struct reset_ctl *rst)
46{
47 return 0;
48}
49
50static int bcm6345_reset_request(struct reset_ctl *rst)
51{
52 if (rst->id >= MAX_RESETS)
53 return -EINVAL;
54
55 return bcm6345_reset_assert(rst);
56}
57
58struct reset_ops bcm6345_reset_reset_ops = {
Simon Glass94474b22020-02-03 07:35:52 -070059 .rfree = bcm6345_reset_free,
Álvaro Fernández Rojas18393f72017-05-03 15:10:21 +020060 .request = bcm6345_reset_request,
61 .rst_assert = bcm6345_reset_assert,
62 .rst_deassert = bcm6345_reset_deassert,
63};
64
65static const struct udevice_id bcm6345_reset_ids[] = {
66 { .compatible = "brcm,bcm6345-reset" },
67 { /* sentinel */ }
68};
69
70static int bcm6345_reset_probe(struct udevice *dev)
71{
72 struct bcm6345_reset_priv *priv = dev_get_priv(dev);
Álvaro Fernández Rojas18393f72017-05-03 15:10:21 +020073
Álvaro Fernández Rojas56d4b702018-03-22 19:39:31 +010074 priv->regs = dev_remap_addr(dev);
75 if (!priv->regs)
Álvaro Fernández Rojas18393f72017-05-03 15:10:21 +020076 return -EINVAL;
77
Álvaro Fernández Rojas18393f72017-05-03 15:10:21 +020078 return 0;
79}
80
81U_BOOT_DRIVER(bcm6345_reset) = {
82 .name = "bcm6345-reset",
83 .id = UCLASS_RESET,
84 .of_match = bcm6345_reset_ids,
85 .ops = &bcm6345_reset_reset_ops,
86 .probe = bcm6345_reset_probe,
Simon Glass41575d82020-12-03 16:55:17 -070087 .priv_auto = sizeof(struct bcm6345_reset_priv),
Álvaro Fernández Rojas18393f72017-05-03 15:10:21 +020088};